JPH1062684A - Projecting lens - Google Patents

Projecting lens

Info

Publication number
JPH1062684A
JPH1062684A JP24106896A JP24106896A JPH1062684A JP H1062684 A JPH1062684 A JP H1062684A JP 24106896 A JP24106896 A JP 24106896A JP 24106896 A JP24106896 A JP 24106896A JP H1062684 A JPH1062684 A JP H1062684A
Authority
JP
Japan
Prior art keywords
lens
positive
back focus
focal length
enlargement side
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP24106896A
Other languages
Japanese (ja)
Other versions
JP3741790B2 (en
Inventor
Tsutomu Yamamoto
力 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujinon Corp
Original Assignee
Fuji Photo Optical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Photo Optical Co Ltd filed Critical Fuji Photo Optical Co Ltd
Priority to JP24106896A priority Critical patent/JP3741790B2/en
Priority to DE1997136623 priority patent/DE19736623A1/en
Publication of JPH1062684A publication Critical patent/JPH1062684A/en
Priority to US09/280,080 priority patent/US6295166B1/en
Application granted granted Critical
Publication of JP3741790B2 publication Critical patent/JP3741790B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/74Projection arrangements for image reproduction, e.g. using eidophor
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/16Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Lenses (AREA)
  • Liquid Crystal (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a telecentric projecting lens having a proper back focus and capable of sufficiently correcting a distortion aberration by specifying the arrangement of lenses and the conditions of focal distance and back focus. SOLUTION: A positive first lens L1 with the convex side turned on enlarging side, a positive second lens L2 with the convex side turned on enlarging side, a third lens L3 formed of a double concave lens, a fourth lens L4 formed of a positive mechanical lens with the convex side turned on contracting side, and a positive fifth lens L5 with the convex side turned on enlarging side are arranged in order from the enlarging side. They are constituted so as to satisfy the following conditional expressions (1)-(4); (1): 0.35<F12 /F<0.65, (2) -0.3<F3 /F<-1.3, (3) 0.5<F5 /F<0.85, (4) 0.35<BF/F<0.55, wherein F12 represents the composed focal distance of the first lens and the second lens, F3 , F5 represent the focal distances of the third and fifth lenses, respectively, F represents the focal distance of the whole lens system, and BF represents the back focus of the whole lens system.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、CCDや撮像管等
の撮像手段あるいは銀塩フィルム等を用いたカメラの結
像レンズとしても使用可能な、投射型テレビに用いられ
る投影レンズに関し、特に、液晶表示パネルを用いた投
射型テレビに好適な投影レンズに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection lens used in a projection type television which can be used as an image pickup means such as a CCD or an image pickup tube or an imaging lens of a camera using a silver halide film or the like. The present invention relates to a projection lens suitable for a projection television using a liquid crystal display panel.

【0002】[0002]

【従来の技術】従来より、液晶表示パネルを用いた投射
型テレビに用いられる投影レンズとしては、液晶表示パ
ネル、照明系や色合成光学系等との関係により、テレセ
ントリックな光学系が要求され、あるいは色合成光学系
を挿入するために長いバックフォーカスが要求されてい
る。このような要求を満足させるためのレンズとして、
例えば特開昭63−81414号公報に記載されたもの
が知られている。このレンズは、従来よりもレンズ枚数
を少なく構成でき、かつ焦点距離と比較してバックフォ
ーカスが長く、テレセントリックな光学系を実現するこ
とができる。
2. Description of the Related Art Conventionally, as a projection lens used in a projection type television using a liquid crystal display panel, a telecentric optical system has been required due to a relationship with a liquid crystal display panel, an illumination system, a color combining optical system, and the like. Alternatively, a long back focus is required to insert a color combining optical system. As a lens to satisfy such requirements,
For example, one described in JP-A-63-81414 is known. This lens can be configured with a smaller number of lenses than in the past, has a longer back focus than the focal length, and can realize a telecentric optical system.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、焦点距
離と比較してバックフォーカスが長すぎると、光学系全
体が大型化するという問題がある。また、液晶表示パネ
ルを用いた光学系においては、テレビあるいは写真より
も歪曲収差が目立つため、これを抑える必要があるが、
上記公報記載のレンズでは、十分に歪曲収差を補正する
ことができなかった。
However, if the back focus is too long compared to the focal length, there is a problem that the entire optical system becomes large. In an optical system using a liquid crystal display panel, distortion is more conspicuous than in a television or a photograph, and it is necessary to suppress this.
The lens described in the above publication could not sufficiently correct distortion.

【0004】本発明はこのような事情に鑑みなされたも
ので、色合成光学系等の光学系を挿入し得る適度なバッ
クフォーカスを有し、テレセントリックで、歪曲収差を
十分に補正し得る投影レンズを提供することを目的とす
るものである。
The present invention has been made in view of such circumstances, and has a proper back focus into which an optical system such as a color combining optical system can be inserted, and is a telecentric projection lens capable of sufficiently correcting distortion. The purpose is to provide.

【0005】[0005]

【課題を解決するための手段】本発明の投影レンズは、
拡大側から順に、拡大側に凸面を向けた正の第1レン
ズ、拡大側に凸面を向けた正の第2レンズ、両凹レンズ
からなる第3レンズ、縮小側に凸面を向けた正のメニス
カスレンズからなる第4レンズ、および拡大側に凸面を
向けた正の第5レンズが配列されてなり、以下の各条件
式(1)〜(4)を満足するように構成されてなること
を特徴とするものである。
The projection lens according to the present invention comprises:
In order from the enlargement side, a positive first lens having a convex surface facing the enlargement side, a positive second lens having a convex surface facing the enlargement side, a third lens including a biconcave lens, and a positive meniscus lens having a convex surface facing the reduction side And a positive fifth lens having a convex surface facing the enlargement side are arranged, and are configured to satisfy the following conditional expressions (1) to (4). Is what you do.

【0006】 (1) 0.35<F12/F<0.65 (2) −3.0<F3/F<−1.3 (3) 0.5<F5/F<0.85 (4) 0.35<BF/F<0.55 ここで、 F12 :第1レンズと第2レンズとの合
成焦点距離 F3 :第3レンズの焦点距離 F5 :第5レンズの焦点距離 F :全レンズ系の焦点距離 BF :全レンズ系のバックフォーカス また、前記第4レンズが以下の条件式(5)を満足する
ように構成されてなることが好ましい。 (5) 1.2<R8/R9<3.2 ここで、 R8 :第4レンズの拡大側の面の曲率
半径 R9 :第4レンズの縮小側の面の曲率半径 さらに、前記第1レンズ内もしくは該第1レンズよりも
拡大側の位置において、軸上光束をカットするように構
成されてなることが好ましい。
(1) 0.35 <F 12 /F<0.65 (2) -3.0 <F 3 /F<-1.3 (3) 0.5 <F 5 /F<0.85 (4) 0.35 <BF / F <0.55 where, F 12 : composite focal length of the first lens and the second lens F 3 : focal length of the third lens F 5 : focal length of the fifth lens F: focal length of all lens systems BF: back focus of all lens systems It is preferable that the fourth lens is configured to satisfy the following conditional expression (5). (5) 1.2 <R 8 / R 9 <3.2 where R 8 is the radius of curvature of the surface on the enlargement side of the fourth lens. R 9 is the radius of curvature of the surface on the reduction side of the fourth lens. It is preferable that the on-axis luminous flux is cut in the first lens or at a position on the enlargement side of the first lens.

【0007】[0007]

【発明の実施の形態】以下、本発明の実施例について図
面を用いて説明する。なお、以下に3つの実施例につい
て具体的に説明するが、各実施例に各々対応する図面の
説明において同一の要素については同一の符号を付し、
重複する説明については省略する。
Embodiments of the present invention will be described below with reference to the drawings. In the following, three embodiments will be specifically described. In the description of the drawings corresponding to each embodiment, the same elements are denoted by the same reference numerals.
A duplicate description is omitted.

【0008】<実施例1>この実施例1のレンズは、図
1に示すように、拡大側から、正の第1レンズL1、正
の第2レンズL2、負の第3レンズL3、正の第4レンズ
4および正の第5レンズL5がこの順に配列されてな
り、かつ下記各条件式を満足するように構成されてい
る。
<Embodiment 1> As shown in FIG. 1, the lens of Embodiment 1 has a positive first lens L 1 , a positive second lens L 2 , and a negative third lens L 3 from the enlargement side. , A positive fourth lens L 4 and a positive fifth lens L 5 are arranged in this order, and are configured to satisfy the following conditional expressions.

【0009】 (1) 0.35<F12/F<0.65 (2) −3.0<F3/F<−1.3 (3) 0.5<F5/F<0.85 (4) 0.35<BF/F<0.55 (5) 1.2<R8/R9<3.2 ここで、 F12 :第1レンズL1と第2レンズL2
との合成焦点距離 F3 :第3レンズL3の焦点距離 F5 :第5レンズの焦点距離 F :全レンズ系の焦点距離 BF :全レンズ系のバックフォーカス R8 :第4レンズの拡大側の面の曲率半径 R9 :第4レンズの縮小側の面の曲率半径
(1) 0.35 <F 12 /F<0.65 (2) -3.0 <F 3 /F<-1.3 (3) 0.5 <F 5 /F<0.85 (4) 0.35 <BF / F <0.55 (5) 1.2 <R 8 / R 9 <3.2 where F 12 : first lens L 1 and second lens L 2
F 3 : focal length of the third lens L 3 F 5 : focal length of the fifth lens F : Focal length of all lens systems BF: back focus of all lens systems R 8 : radius of curvature of the enlargement side surface of the fourth lens R 9 : radius of curvature of the reduction side surface of the fourth lens

【0010】なお、LCD1を透過し、光軸Xに沿って
この投影レンズに入射した光束は、図示されないスクリ
ーン上に拡大して投射される。また、レンズ系の縮小側
(LCD側)には色合成光学系2が配されている。な
お、第1レンズL1よりも拡大側には、軸上光束遮蔽手
段3が設けられており、軸上光束をカットするようにな
っている。
A light beam transmitted through the LCD 1 and incident on the projection lens along the optical axis X is magnified and projected on a screen (not shown). A color combining optical system 2 is arranged on the reduction side (LCD side) of the lens system. Incidentally, the magnification side than the first lens L 1 is the axial light beam blocking means 3 is provided, so as to cut the axial light beam.

【0011】ここで、第1レンズL1および第2レンズ
2は拡大側に凸面を向けた正のメニスカスレンズ、第
3レンズL3は拡大側に強い曲率の面を向けた両凹レン
ズ、第4レンズL4は縮小側に凸面を向けた正のメニス
カスレンズ、第5レンズL5は拡大側に強い曲率の面を
向けた両凸レンズである。
Here, the first lens L 1 and the second lens L 2 are a positive meniscus lens having a convex surface facing the enlargement side, the third lens L 3 is a biconcave lens having a surface with a strong curvature facing the enlargement side, 4 lens L 4 is a positive meniscus lens having a convex surface facing the reduction side, and the fifth lens L 5 is a biconvex lens having a surface with a stronger curvature directed onto the enlargement side.

【0012】次に、上記条件式(1)〜(5)について
説明する。条件式(1)の上限を越えて第1レンズL1
と第2レンズL2との合成焦点距離が長くなると、バッ
クフォーカスが大きくなりすぎてしまい、一方、条件式
(1)の下限を越えて第1レンズL1と第2レンズL2
の合成焦点距離が短くなると、収差の補正が困難となっ
たり、バックフォーカスが短くなりすぎてしまうが、本
実施例においてはこの条件式(1)を満足しており、バ
ックフォーカスを適当な大きさとすることができ、ま
た、収差の補正を良好なものとすることできる。
Next, the conditional expressions (1) to (5) will be described. Beyond the upper limit of conditional expression (1), the first lens L 1
Synthesis of the the composite focal length of the second lens L 2 becomes long, the back focus becomes too large, on the other hand, conditional expressions and the first lens L 1 than the lower of (1) and the second lens L 2 When the focal length becomes short, it becomes difficult to correct aberration or the back focus becomes too short. However, in this embodiment, the conditional expression (1) is satisfied, and the back focus is set to an appropriate size. In addition, aberration can be corrected well.

【0013】また、条件式(2)の上限、下限のどちら
を越えても、第3レンズL3が唯一の負のレンズである
ため、収差のバランスが崩れ、収差を補正することが困
難となるが、本実施例ではこの条件式(2)を満足して
おり、収差のバランスを良好なものとすることができ
る。
Further, the upper limit of condition (2), since even beyond either limit, the third lens L 3 is the only negative lens, unbalanced aberrations, difficult to correct aberrations However, in this embodiment, the conditional expression (2) is satisfied, and the aberration balance can be improved.

【0014】また、条件式(3)の上限を越え、第5レ
ンズL5の焦点距離が長くなると、バックフォーカスが
長くなりすぎたり、収差を補正することが困難となり、
一方、条件式(3)の下限を越え、第5レンズL5の焦
点距離が短くなると、収差の補正、特に歪曲収差の補正
が困難となるが、本実施例ではこの条件式(3)を満足
しており、バックフォーカスを適当な長さとすることが
でき、また、収差の補正、特に歪曲収差の補正を良好な
ものとすることができる。
Further, beyond the upper limit of condition (3), the focal length of the fifth lens L 5 is increased, or the back focus becomes too long, it becomes difficult to correct the aberration,
On the other hand, below the lower limit of condition (3), the focal length of the fifth lens L 5 becomes shorter, correction of aberrations, but especially correct distortion becomes difficult, in this embodiment the conditional expression (3) Satisfaction is satisfied, and the back focus can be set to an appropriate length, and the correction of aberration, particularly the correction of distortion can be improved.

【0015】また、条件式(4)の上限を越え、バック
フォーカスが長くなると、光学系全体が大型化してしま
い、一方、条件式(4)の下限を越え、バックフォーカ
スが大幅に短くなると、第5レンズL5と結像面との間
に色合成光学系等を挿入することができなくなってしま
うが、本実施例ではこの条件式(4)を満足しており、
光学系全体の大型化を防止しつつ、光路中に色合成光学
系等の挿入を可能としている。
If the upper limit of conditional expression (4) is exceeded and the back focus becomes longer, the entire optical system becomes larger. On the other hand, if the lower limit of conditional expression (4) is exceeded and the back focus becomes significantly shorter, it becomes impossible to insert a color combining optical system or the like between the fifth lens L 5 and the image plane, but in the present embodiment has satisfied this condition (4),
It is possible to insert a color combining optical system or the like into the optical path while preventing the entire optical system from being enlarged.

【0016】また、条件式(5)の上限を越えると、収
差補正、とくに像面湾曲の補正が困難となり、一方、条
件式(5)の下限を越えると、レンズ自体の製造が困難
となるが、本実施例ではこの条件式(5)を満足してい
るため、像面湾曲等の補正が容易となり、レンズ自体の
製造が容易となる。
If the upper limit of conditional expression (5) is exceeded, it will be difficult to correct aberrations, especially correction of field curvature. If the lower limit of conditional expression (5) is exceeded, it will be difficult to manufacture the lens itself. However, in the present embodiment, since conditional expression (5) is satisfied, correction of curvature of field and the like becomes easy, and manufacture of the lens itself becomes easy.

【0017】さらに、第1レンズL1あるいは第1レン
ズL1よりも拡大側において軸上光束遮蔽手段を挿入し
ないと、角度のきつい軸外光束をカットできなくなって
拡大側のレンズ径が大きくなり、またテレセントリック
性が失われることになるが、本実施例では第1レンズL
1よりも拡大側に軸上光束をカットする手段3を挿入し
ているので拡大側のレンズ径の拡大化を防止しつつテレ
セントリック性を保持することができる。
Furthermore, unless the first lens L 1 or the on-axis light beam shielding means is inserted on the side of the enlargement with respect to the first lens L 1 , the off-axis light beam with a sharp angle cannot be cut, and the lens diameter on the enlargement side becomes large. In this embodiment, the first lens L
Since the means 3 for cutting the on-axis light beam is inserted on the enlargement side rather than 1, the telecentricity can be maintained while preventing the enlargement of the lens diameter on the enlargement side.

【0018】次に、この実施例1における各レンズ面の
曲率半径R(mm)、各レンズの中心厚および各レンズ
間の空気間隔D(mm)、各レンズのd線における屈折
率Nおよびアッベ数νを下記表1に示す。ただし、この
表1および後述する表2、3において、各記号R,D,
N,νに対応させた数字は拡大側から順次増加するよう
になっている。なお、表1の下段に本実施例における条
件式(1)〜(5)の値を示す。
Next, in Example 1, the radius of curvature R (mm) of each lens surface, the center thickness of each lens, the air gap D (mm) between each lens, the refractive index N of each lens at d-line, and Abbe The number ν is shown in Table 1 below. However, in Table 1 and Tables 2 and 3 described later, each symbol R, D,
The numbers corresponding to N and ν are sequentially increased from the enlargement side. Note that the lower part of Table 1 shows values of the conditional expressions (1) to (5) in this embodiment.

【0019】[0019]

【表1】 [Table 1]

【0020】また、この実施例1におけるレンズのFナ
ンバおよび半画角ωは各々3.00および10.7°で
ある。
In the first embodiment, the F number and the half angle of view ω of the lens are 3.00 and 10.7 °, respectively.

【0021】<実施例2>次に、実施例2の投影レンズ
について図2を用いて説明する。この実施例2のレンズ
は、図2に示すように、上記実施例1のレンズとほぼ同
様のレンズ構成とされているが、主として、第4レンズ
4と第5レンズL5が極めて接近している点で上記実施
例1のものとは異なっている。
<Embodiment 2> Next, a projection lens of Embodiment 2 will be described with reference to FIG. Lenses this second embodiment, as shown in FIG. 2, although there is a lens arrangement nearly similar to the lens in Example 1, mainly includes a fourth lens L 4 is the fifth lens L 5 in close proximity This is different from the first embodiment.

【0022】なお、前述した条件式(1)〜(5)は全
て満足されており、さらに第1レンズL1よりも拡大側
には、軸上光束遮蔽手段3が設けられている。この実施
例2における各レンズ面の曲率半径R(mm)、各レン
ズの中心厚および各レンズ間の空気間隔D(mm )、
各レンズのd線における、屈折率Nおよびアッベ数νを
下記表2に示す。なお、表2の下段に本実施例の条件式
(1)〜(5)の値を示す。
[0022] Incidentally, the above-mentioned conditional expressions (1) to (5) are all satisfied, the further expansion side of the first lens L 1 is the axial light beam shielding means 3 is provided. In Example 2, the radius of curvature R (mm) of each lens surface, the center thickness of each lens, and the air gap D (mm) between each lens,
Table 2 below shows the refractive index N and Abbe number ν at the d-line of each lens. Note that the lower part of Table 2 shows the values of the conditional expressions (1) to (5) of the present embodiment.

【0023】[0023]

【表2】 [Table 2]

【0024】また、この実施例2におけるレンズのFナ
ンバおよび半画角ωは各々3.00および10.9°で
ある。
Further, the F number and the half angle of view ω of the lens in Example 2 are 3.00 and 10.9 °, respectively.

【0025】<実施例3>実施例3の投影レンズは、上
記実施例2のレンズとほぼ同様のレンズ構成とされてい
るため、図示は省略する。なお、前述した条件式(1)
〜(5)は全て満足されており、さらに第1レンズL1
よりも拡大側には、軸上光束遮蔽手段3が設けられてい
る。
<Embodiment 3> The projection lens of Embodiment 3 has substantially the same lens configuration as the lens of Embodiment 2 and is not shown. Note that the conditional expression (1) described above is used.
(5) are all satisfied, and the first lens L 1
On the enlarged side, an on-axis light beam shielding means 3 is provided.

【0026】この実施例3における各レンズ面の曲率半
径R(mm)、各レンズの中心厚および各レンズ間の空
気間隔D(mm)、各レンズのd線における、屈折率N
およびアッベ数νを下記表3に示す。なお、表3の下段
に条件式(1)〜(5)の値を示す。
In Example 3, the radius of curvature R (mm) of each lens surface, the center thickness of each lens, the air gap D (mm) between each lens, and the refractive index N at the d-line of each lens
Table 3 below shows the Abbe number. Note that the lower part of Table 3 shows the values of the conditional expressions (1) to (5).

【0027】[0027]

【表3】 [Table 3]

【0028】また、この実施例3におけるレンズのFナ
ンバおよび半画角ωは各々3.00および10.9°で
ある。なお、上記実施例1〜3に対応させてその各収差
図(球面収差、非点収差およびディストーションの収差
図)を各々図3〜5に示す。なお、この収差図において
ωは半画角を示す。
The F number and the half angle of view ω of the lens in the third embodiment are 3.00 and 10.9 °, respectively. The respective aberration diagrams (spherical aberration, astigmatism, and distortion aberration diagrams) corresponding to Examples 1 to 3 are shown in FIGS. In this aberration diagram, ω indicates a half angle of view.

【0029】また、各球面収差図においては e線、F
線およびC線に対する収差が示されている。さらに、各
非点収差図には、サジタル(S)像面およびタンジェン
シャル(T)像面に対する収差が示されている。これら
図3〜5から明らかなように、上述した各実施例におい
ては、前述した各収差を全て良好なものとすることがで
きる。
In each spherical aberration diagram, e-line, F
The aberrations for the line and the C line are shown. Further, each astigmatism diagram shows aberrations with respect to a sagittal (S) image plane and a tangential (T) image plane. As is apparent from FIGS. 3 to 5, in each of the above-described embodiments, all the above-described aberrations can be made favorable.

【0030】なお、本発明の投影レンズとしては、上記
実施例のものに限られるものではなく種々の態様の変更
が可能であり、例えば各レンズの曲率半径Rおよびレン
ズ間隔(もしくはレンズ厚)Dを適宜変更することが可
能である。なお、上記実施例においては、本発明のレン
ズを液晶表示パネルの投影レンズとして用いているが、
本発明の投影レンズの使用態様はこれに限られるもので
はなく、各種カメラの結像レンズ等として用いることも
可能である。
The projection lens according to the present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the radius of curvature R of each lens and the lens interval (or lens thickness) D Can be appropriately changed. In the above embodiment, the lens of the present invention is used as a projection lens of a liquid crystal display panel.
The usage mode of the projection lens of the present invention is not limited to this, and it can be used as an imaging lens of various cameras.

【0031】[0031]

【発明の効果】以上、詳細に説明した通り、本発明の投
影レンズによれば、バックフォーカスを適当な大きさと
することができるので縮小側に色合成光学系等を挿入可
能なバックフォーカスを確保しつつ、全光学系のサイズ
を小型化することができる。また、歪曲収差等の収差の
補正を良好なものとすることができる。
As described in detail above, according to the projection lens of the present invention, the back focus can be set to an appropriate size, so that the back focus for inserting the color combining optical system or the like on the reduction side is secured. In addition, the size of the entire optical system can be reduced. In addition, it is possible to improve the correction of aberrations such as distortion.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施例1に係るレンズ基本構成を示す
概略図
FIG. 1 is a schematic diagram illustrating a basic lens configuration according to a first embodiment of the present invention.

【図2】本発明の実施例2に係るレンズ基本構成を示す
概略図
FIG. 2 is a schematic diagram illustrating a basic lens configuration according to a second embodiment of the present invention.

【図3】実施例1に係るレンズの各収差図FIG. 3 is a diagram illustrating each aberration of the lens according to the first embodiment.

【図4】実施例2に係るレンズの各収差図FIG. 4 is a diagram illustrating each aberration of the lens according to the second embodiment.

【図5】実施例3に係るレンズの各収差図FIG. 5 is a diagram illustrating each aberration of the lens according to the third embodiment.

【符号の説明】[Explanation of symbols]

1 〜L5 レンズ R1 〜R13 レンズ面あるいは色合成光学系の端面の
曲率半径 D1 〜D12 レンズ面間隔(レンズ厚) X 光軸 P 結像位置 1 LCD 2 色合成光学系 3 軸上光束遮蔽手段
L 1 to L 5 Lens R 1 to R 13 Lens surface or radius of curvature of the end surface of the color combining optical system D 1 to D 12 Lens surface interval (lens thickness) X Optical axis P Image forming position 1 LCD 2 Color combining optical system 3 On-axis luminous flux shielding means

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 拡大側から順に、拡大側に凸面を向けた
正の第1レンズ、拡大側に凸面を向けた正の第2レン
ズ、両凹レンズからなる第3レンズ、縮小側に凸面を向
けた正のメニスカスレンズからなる第4レンズ、および
拡大側に凸面を向けた正の第5レンズが配列されてな
り、以下の各条件式(1)〜(4)を満足するように構
成されてなることを特徴とする投影レンズ。 (1) 0.35<F12/F<0.65 (2) −3.0<F3/F<−1.3 (3) 0.5<F5/F<0.85 (4) 0.35<BF/F<0.55 ここで、 F12 :第1レンズと第2レンズとの合
成焦点距離 F3 :第3レンズの焦点距離 F5 :第5レンズの焦点距離 F :全レンズ系の焦点距離 BF :全レンズ系のバックフォーカス
1. A positive first lens having a convex surface facing the enlargement side, a positive second lens having a convex surface facing the enlargement side, a third lens including a biconcave lens, and a convex surface facing the reduction side in order from the enlargement side. A fourth lens composed of a positive meniscus lens and a positive fifth lens having a convex surface facing the enlargement side are arranged, and are configured to satisfy the following conditional expressions (1) to (4). A projection lens characterized in that: (1) 0.35 <F 12 /F<0.65 (2) -3.0 <F 3 /F<-1.3 (3) 0.5 <F 5 /F<0.85 (4) 0.35 <BF / F <0.55 where F 12 : composite focal length of the first lens and the second lens F 3 : focal length of the third lens F 5 : focal length of the fifth lens F: all Focal length of lens system BF: Back focus of all lens systems
【請求項2】 前記第4レンズが以下の条件式(5)を
満足するように構成されてなることを特徴とする請求項
1記載の投影レンズ。 (5) 1.2<R8/R9<3.2 ここで、 R8 :第4レンズの拡大側の面の曲率
半径 R9 :第4レンズの縮小側の面の曲率半径
2. The projection lens according to claim 1, wherein the fourth lens is configured to satisfy the following conditional expression (5). (5) 1.2 <R 8 / R 9 <3.2 where R 8 is the radius of curvature of the enlargement side surface of the fourth lens R 9 is the radius of curvature of the reduction side surface of the fourth lens
【請求項3】 前記第1レンズ内もしくは該第1レンズ
よりも拡大側の位置において、軸上光束をカットするよ
うに構成されてなることを特徴とする請求項1または2
記載の投影レンズ。
3. The optical system according to claim 1, wherein an on-axis light beam is cut in the first lens or at a position on an enlarged side of the first lens.
The projection lens as described.
JP24106896A 1996-08-22 1996-08-22 Projection lens Expired - Lifetime JP3741790B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP24106896A JP3741790B2 (en) 1996-08-22 1996-08-22 Projection lens
DE1997136623 DE19736623A1 (en) 1996-08-22 1997-08-22 Projection objective lens for television projection system
US09/280,080 US6295166B1 (en) 1996-08-22 1999-03-29 Projection lens for projection type of television system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24106896A JP3741790B2 (en) 1996-08-22 1996-08-22 Projection lens

Publications (2)

Publication Number Publication Date
JPH1062684A true JPH1062684A (en) 1998-03-06
JP3741790B2 JP3741790B2 (en) 2006-02-01

Family

ID=17068827

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24106896A Expired - Lifetime JP3741790B2 (en) 1996-08-22 1996-08-22 Projection lens

Country Status (2)

Country Link
JP (1) JP3741790B2 (en)
DE (1) DE19736623A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6038078A (en) * 1998-08-24 2000-03-14 Fuji Photo Optical Co., Ltd. Projection lens
KR101053288B1 (en) 2009-12-22 2011-08-01 삼성전기주식회사 Imaging optics
CN115201997A (en) * 2021-04-08 2022-10-18 宁波舜宇车载光学技术有限公司 Optical lens and electronic device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2306599B1 (en) * 2007-04-24 2009-09-03 Joan Aguado Moreno DIGITAL COPIER OF SLIDES.
WO2008129109A1 (en) * 2007-04-24 2008-10-30 Joan Aguado Moreno Digital copier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6038078A (en) * 1998-08-24 2000-03-14 Fuji Photo Optical Co., Ltd. Projection lens
KR101053288B1 (en) 2009-12-22 2011-08-01 삼성전기주식회사 Imaging optics
CN115201997A (en) * 2021-04-08 2022-10-18 宁波舜宇车载光学技术有限公司 Optical lens and electronic device

Also Published As

Publication number Publication date
DE19736623A1 (en) 1998-02-26
JP3741790B2 (en) 2006-02-01

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